ord is to be found even among holy men, for it is
written (Acts 15:39): "There arose a dissension" between Paul and
Barnabas, "so that they departed one from another." Therefore discord
is not a sin, and least of all a mortal sin.

_On the contrary,_ "Dissensions," that is, discords, are reckoned
among the works of the flesh (Gal. 5:20), of which it is said
afterwards (Gal. 5:21) that "they who do such things shall not obtain
the kingdom of God." Now nothing, save mortal sin, excludes man from
the kingdom of God. Therefore discord is a mortal sin.

_I answer that,_ Discord is opposed to concord. Now, as stated above
(Q. 29, AA. 1, 3) concord results from charity, in as much as charity
directs many hearts together to one thing, which is chiefly the
Divine good, secondarily, the good of our neighbor. Wherefore discord
is a sin, in so far as it is opposed to this concord.

But it must be observed that this concord is destroyed by discord in
two ways: first, directly; secondly, accidentally. Now, human acts
and movements are said to be direct when they are according to one's
intention. Wherefore a man directly disaccords with his neighbor,
when he knowingly and intentionally dissents from the Divine good and
his neighbor's good, to which he ought to consent. This is a mortal
sin in respect of its genus, because it is contrary to charity,
although the first movements of such discord are venial sins by
reason of their being imperfect acts.

The accidental in human acts is that which occurs beside the
intention. Hence when several intend a good pertaining to God's
honor, or our neighbor's profit, while one deems a certain thing
good, and another thinks contrariwise, the discord is in this case
accidentally contrary to the Divine good or that of our neighbor.
Such like discord is neither sinful nor against charity, unless it be
accompanied by an error about things necessary to salvation, or by
undue obstinacy, since it has also been stated above (Q. 29, AA. 1,
3, ad 2) that the concord which is an effect of charity, is union of
wills not of opinions. It follows from this that discord is sometimes
the sin of one party only, for instance, when one wills a good which
the other knowingly resists; while sometimes it implies sin in both
parties, as when each dissents from the other's good, and loves his
own.

Reply Obj. 1: One man's will considered in itself is not the rule of
another man's will; but in so far as our neighbor's